X-Git-Url: https://de.git.xonotic.org/?a=blobdiff_plain;f=snd_oss.c;h=eef8e62c9681a851357b69ec8ddba4e79e3b7ee4;hb=390250f388e317c5d3e218d6026d4e9a4d760777;hp=d06e4780b9d14ecdbbfe4b5438f413d116caec43;hpb=ad40941adf0fe050fcc609b588cc05266bf26b84;p=xonotic%2Fdarkplaces.git

diff --git a/snd_oss.c b/snd_oss.c
index d06e4780..eef8e62c 100644
--- a/snd_oss.c
+++ b/snd_oss.c
@@ -17,6 +17,9 @@ along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 */
+
+// OSS module, used by Linux and FreeBSD
+
 #include <unistd.h>
 #include <fcntl.h>
 #include <stdlib.h>
@@ -28,6 +31,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #include <sys/soundcard.h>
 #include <stdio.h>
 #include "quakedef.h"
+#include "snd_main.h"
 
 int audio_fd;
 int snd_inited;
@@ -53,7 +57,7 @@ qboolean SNDDMA_Init(void)
 	snd_inited = 0;
 
 	// open /dev/dsp, confirm capability to mmap, and get size of dma buffer
-    audio_fd = open("/dev/dsp", O_RDWR);
+    audio_fd = open("/dev/dsp", O_RDWR);  // we have to open it O_RDWR for mmap
 	if (audio_fd < 0)
 	{
 		perror("/dev/dsp");
@@ -96,6 +100,7 @@ qboolean SNDDMA_Init(void)
 	s = getenv("QUAKE_SOUND_SAMPLEBITS");
 	if (s)
 		shm->format.width = atoi(s) / 8;
+// COMMANDLINEOPTION: Linux OSS Sound: -sndbits <bits> chooses 8 bit or 16 bit sound output
 	else if ((i = COM_CheckParm("-sndbits")) != 0)
 		shm->format.width = atoi(com_argv[i+1]) / 8;
 
@@ -111,11 +116,12 @@ qboolean SNDDMA_Init(void)
 	s = getenv("QUAKE_SOUND_SPEED");
 	if (s)
 		shm->format.speed = atoi(s);
+// COMMANDLINEOPTION: Linux OSS Sound: -sndspeed <hz> chooses 44100 hz, 22100 hz, or 11025 hz sound output rate
 	else if ((i = COM_CheckParm("-sndspeed")) != 0)
 		shm->format.speed = atoi(com_argv[i+1]);
 	else
 	{
-		for (i = 0;i < (int) sizeof(tryrates) / 4;i++)
+		for (i = 0;i < (int) sizeof(tryrates) / (int) sizeof(tryrates[0]);i++)
 			if (!ioctl(audio_fd, SNDCTL_DSP_SPEED, &tryrates[i]))
 				break;
 
@@ -125,42 +131,22 @@ qboolean SNDDMA_Init(void)
 	s = getenv("QUAKE_SOUND_CHANNELS");
 	if (s)
 		shm->format.channels = atoi(s);
+// COMMANDLINEOPTION: Linux OSS Sound: -sndmono sets sound output to mono
 	else if ((i = COM_CheckParm("-sndmono")) != 0)
 		shm->format.channels = 1;
-	else if ((i = COM_CheckParm("-sndstereo")) != 0)
-		shm->format.channels = 2;
-	else
+// COMMANDLINEOPTION: Linux OSS Sound: -sndstereo sets sound output to stereo
+	else // if ((i = COM_CheckParm("-sndstereo")) != 0)
 		shm->format.channels = 2;
 
-	shm->samples = info.fragstotal * info.fragsize / shm->format.width;
-
-	// memory map the dma buffer
-	shm->bufferlength = info.fragstotal * info.fragsize;
-	shm->buffer = (unsigned char *) mmap(NULL, shm->bufferlength, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED, audio_fd, 0);
-	if (!shm->buffer || shm->buffer == (unsigned char *)-1)
-	{
-		perror("/dev/dsp");
-		Con_Print("Could not mmap /dev/dsp\n");
-		close(audio_fd);
-		return 0;
-	}
-
-	tmp = 0;
-	if (shm->format.channels == 2)
-		tmp = 1;
-
+	tmp = (shm->format.channels == 2);
 	rc = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
 	if (rc < 0)
 	{
 		perror("/dev/dsp");
-		Con_Printf("Could not set /dev/dsp to stereo=%d\n", shm->format.channels);
+		Con_Printf("Could not set /dev/dsp to stereo=%d\n", tmp);
 		close(audio_fd);
 		return 0;
 	}
-	if (tmp)
-		shm->format.channels = 2;
-	else
-		shm->format.channels = 1;
 
 	rc = ioctl(audio_fd, SNDCTL_DSP_SPEED, &shm->format.speed);
 	if (rc < 0)
@@ -203,6 +189,19 @@ qboolean SNDDMA_Init(void)
 		return 0;
 	}
 
+	shm->samples = info.fragstotal * info.fragsize / shm->format.width;
+
+	// memory map the dma buffer
+	shm->bufferlength = info.fragstotal * info.fragsize;
+	shm->buffer = (unsigned char *) mmap(NULL, shm->bufferlength, PROT_WRITE, MAP_FILE|MAP_SHARED, audio_fd, 0);
+	if (!shm->buffer || shm->buffer == (unsigned char *)-1)
+	{
+		perror("/dev/dsp");
+		Con_Print("Could not mmap /dev/dsp\n");
+		close(audio_fd);
+		return 0;
+	}
+
 	// toggle the trigger & start her up
 	tmp = 0;
 	rc  = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);